I'm excited, but a bit nervous, too, since this will be my first time completely splitting up all my kids! I believe it will be the best for them, though. I am also using the workbox system and think that I have it pretty well set up and organized. My biggest concern is getting a good schedule and rotating between all three of my kiddos, but I'm sure eventually we'll get into a good rythm (atleast I hope!). If any of you have used the same 3 programs that I'm using, I'd love to see your schedules! 
I've looked on this message board and have gotten some good ideas, but haven't seen any with these exact programs. Also, my other concern is that I won't have enough "extra" activities for my pre-schooler. I've gotten lots of good ideas on here and elsewhere, though, and am hoping it will all work out. I'm also adding in a few more "subjects" to LHTH as my pre-schooler is almost 5, and I feel she is ready. Just some R&S preschool workbooks, A Reason for Handwriting K, and LHFHG Kindergarten Science. We will see how all that works out as well. Just wanted to say we are excited and hoping we've found a curriculum we'll be sticking with for a long time! 
And, as you can see by my signature we are a couple months behind on our start date. That's because my husband and I opened a new business at the end of August and we've been busy getting that up and running so school was pushed back a bit. But now it's time, and I'm excited!
But, I'm hoping today he will be back on track.